Mann's most famous works include the monumental The Sources of Social Power (four volumes) and The Dark Side of Democracy, spanning the entire 20th century. He also published Incoherent Empire, where he attacks the United States' 'War on Terror' as a clumsy experiment in neo-imperialism.

The last two volumes of The Sources of Social Power - Global Empires and Revolution 1890-1945 and Globalizations 1945-2011, were published by CUP in 2012 and 2013 respectively.